Hey, As we all know the Mac Pro (late 2013) came with HDMI 1.4 ports. HDMI 1.4 is identical to HDMI 2.0 hardware wise, and more and more manufacturers are issuing firmwares to update 1.4 ports to 2.0. Currently, Apple is about to release 10.9.3 which will add support for 4K/60Hz over DisplayPort. But so far there is no indication that 4k/60Hz HDMI will happen. So I want to encourage everyone to join me in sending feedback to the Mac Pro team that this is something we really want, as none of the 4K televisions come with Display Ports. Here is the link: http://www.apple.com/feedback/mac-pro.html Tell them you would like a firmware update for Mac Pro (late 2013) to update the HDMI ports from 1.4 to 2.0 and add support for 4k/60Hz over HDMI. Thanks!